Siemens SITRANS 7MF1570 Manuale utente

USER'S MANUAL

Siemens

Energy & Automation

UMMPS-1

Rev. 2

January 2003

Supersedes Rev. 1

MG00420a

Pressure Transmitter for

Level Measurement

Model 7MF1570

UMMPS-1 Contents

January 2003 i

Table of Contents

Title Page

Introduction ...................................................................................................................................................................1

Operation .......................................................................................................................................................................2

Installation .....................................................................................................................................................................3

Wiring............................................................................................................................................................................4

Calibration .....................................................................................................................................................................4

Maintenance ..................................................................................................................................................................5

Model Designation ........................................................................................................................................................5

Specifications ................................................................................................................................................................6

Junction Box..................................................................................................................................................................7

Cable Hanger .................................................................................................................................................................8

Product Support .............................................................................................................................................................8

Warranty......................................................................................................................................................................10

Contents UMMPS-1

January 2003ii

UMMPS-1 Installation and Maintenance

January 2003 1

Introduction

The Siemens Model 7MF1570 pressure transmitter is used for hydrostatic liquid level measurement. Typical

applications include wastewater treatment and water supply, and many other applications in a variety of industries.

The transmitter measures hydrostatic pressure using the formula:

p = ρ* g * h

with:

ρ- density of the liquid

g - acceleration due to gravity

h - height of the liquid column

Hmax

Hmin

MG00414a

Transmitter

Junction Box

(Cable Connections)

Cable

(4-20 mA,

Vent Pipe, &

Support)

Open Vessel

Cable to Process

Instruments

Cable Hanger

FIGURE 1 Typical Application

The transmitter and cable are a single assembly. Transmitter range and cable length are determined by the model

ordered. Range and other transmitter information are printed on the sensor housing.

The transmitter has a sealed stainless steel housing that includes all pressure-to-current circuitry and is suitable for

use in corrosive liquids. Pressure is sensed by a flush-mounted stainless steel diaphragm connected to a bridge-

configured piezo-resistive sensor. The diaphragm is protected by a cap with perforations that allow the process

liquid to act on the diaphragm. Temperature compensation allows the transmitter to provide an accurate

measurement over a wide range of process temperatures.

The cable contains two wires to carry the 4-20 mA signal, a cable sheath ground wire, a cord to support the sensor,

and a vent pipe to supply atmospheric pressure to the sensor.

Note the following points when selecting an application and when using the device:

• Do not exceed the maximum permissible pressure p max of the transmitter. See the Specifications section.

• The transmitter can be damaged if the process medium in contact with the transmitter exceeds 80°C (176°F).

• The transmitter can be damaged if ice forms on the diaphragm.

• Measuring accuracy will be affected by clogging of the perforations in the protective cap.

• Measuring accuracy will be affected if the vent pipe is obstructed.

Installation and Maintenance UMMPS-1

January 20032

Operation

The hydrostatic pressure felt by the sensor is proportional to submersion depth. The pressure of the process medium

deflects the stainless steel diaphragm at the tip of the transmitter. This deflection is sensed by a piezo-resistive

bridge. The diaphragm and bridge also sense the atmospheric (barometric) pressure supplied through a vent pipe in

the connecting cable.

Const.

IEM

Diaphragm

Sensor

Vent Pipe

Shield

+ Brown

- Blue

Io, UB

MG00415b

Cable Jacket

FIGURE 2 Block Diagram

The bridge output voltage is a pressure differential signal that is then converted to a 4-20 mA output current. The

circuit board is sealed in the housing.

The transmitter is powered from a user-supplied 10-36 Vdc source. Diodes at the transmitter input protect against

reverse polarity and over voltage.

An optional junction box provides screw terminals for cable termination and for connecting to a receiving

instrument, such as a Siemens Model 353 Process Automation Controller. The cable shield is connected to the

housing and is connected by the user to earth ground. Within the junction box, the vent pipe is exposed to

atmospheric pressure.

UMMPS-1 Installation and Maintenance

January 2003 3

Installation

The transmitter is installed suspended on the cable. The cable is routed through a cable hanger and into the junction

box as shown in figure 1. Figure 3 shows transmitter dimensions.

+ Brown

Vent Pipe

Cord, White

- Blue

Shield

158 mm

6.22 in. L

Protective Cap Cable Sheath

27 mm

1.06 in.

MG00416b

1. Dimensions are in millimeters and inches.

2. Cable sheath 8.3 mm / 0.23 in. diameter; black, HFFR

3. Flexible cable with 0.5 mm2/ 10 AWG cross-section

4. Vent pipe 1 mm / 0.04 in. inner diameter

5. Protective cap with 4 x 3 mm / 0.15 x 0.12 in. diameter holes; black, PA

FIGURE 3 Transmitter Dimensions

In a moving medium, transmitter location must be fixed to prevent measuring errors. To minimize movement, install

a guide tube, add a weight on the transmitter (maximum tensile force on the cord is 65 lbs), or install a bracket

between the transmitter and the vessel.

Anchor the cable above the vessel with the cable hanger; see the Cable Hanger section later in this manual. Connect

the cable leads to the junction box; see the Junction Box section later in this manual. Mount the junction box in a

location compatible with its degree of protection (IP 54).

There are four inlet holes in the protective cap at the diaphragm end of the transmitter. These holes must be open to

the medium and free of congealed material and contaminants (e.g. dust, dirt, grease) to ensure transmitter accuracy.

If gelled or solidified material is likely to accumulate at the bottom of the vessel, the tip of the sensor should be

elevated above the level at which the vessel will be drained and cleaned.

Installation and Maintenance UMMPS-1

January 20034

Wiring

WARNING

Electrical shock hazard

Hazardous voltage can cause death or serious injury.

Remove power from all wires and terminals before working

on this equipment.

1. Remove power from all wires and terminals to eliminate any electrical shock hazard.

2. Route the transmitter cable through the cable hanger and into the junction box.

3. Connect the transmitter cable to the junction box. See Figures 3 and 4.

Blue wire to Terminal 1 (-)

Brown wire to Terminal 2 (+)

Shield wire to Ground

Blue

Screen

Brown

Transmitter

Vent Pipe

To Atmospheric Pressure

Junction Box

User-Supplied

10-36 Vdc

Power Supply

Controller,

Recorder, or

other process

instrument

MG00417a

GND

FIGURE 4 Electrical Connections

4. Clamp the cord between the two screws provided in the box.

5. Find the end of the vent pipe. This end of the pipe must be open and exposed to atmospheric pressure.

6. Connect a user-supplied 10-36 Vdc power supply to terminals 1 and 2 in the junction box. The resistance value

for the maximum load depends on the voltage UB. It is determined by the following equation:

UB - 10 V

R max = ————— (kOhm)

20 mA

Calibration

The transmitter has been calibrated at the factory to the user-specified measuring range. It cannot be re-calibrated.

UMMPS-1 Installation and Maintenance

January 2003 5

Maintenance

The transmitter requires no periodic or scheduled maintenance.

Transmitter accuracy and responsiveness can be degraded should gelled or solidified material plug or partially plug

the holes in the protective cap or accumulate within the cap and coat the diaphragm. To remove this material, lift the

transmitter from the vessel. Apply a low-pressure stream of clean water to unplug the holes and wash material from

inside the cap. A mild detergent that will not leave a residue may be added to the water.

The protective cap may be unscrewed from the transmitter body for cleaning. If the cap is difficult to unscrew and

additional leverage is needed, carefully insert a 1/8" (3.2mm) diameter metal rod through two opposing holes in the

cap. Do not scratch the diaphragm while inserting the rod.

When installing the cap, be careful not to damage the threads in the cap. Use your hands, no tools, and feel for

proper thread engagement.

CAUTION

Do not scratch the transmitter diaphragm.

Harsh solvents may damage the protective cap.

Do not use the transmitter without the protective cap.

Model Designation

Each transmitter has a nameplate with the transmitter’s model designation printed on it. The following table lists the

available transmitter models. If ordering, select the desired measuring range, read across the table to the Range

Character (*) and insert that character into the model number at the head of the column.

Example: 7MF1570-1MA01

SITRANS P Pressure Transmitter, MPS Series (Submersible Sensor),

Two-Wire System 7MF1570-1*A01

Measuring Range Cable Length (L) * Range Character

0-6 ft WC 32.8 ft (10 m) K

0-12 ft WC 32.8 ft (10 m) L

0-20 ft WC 82.0 ft (25 m) M

0-30 ft WC 82.0 ft (25 m) N

0-60 ft WC 82.0 ft (25 m) P

Accessories

Junction Box (to connect transmitter cable to field wiring) 7MF1570-8AA

Cable Hanger (to mount/hand the transmitter) 7MF1570-8AB

Installation and Maintenance UMMPS-1

January 20036

Specifications

Input

Measured variable

Pressure

Measuring range Overload limit

0-6 ft WC 47 ft WC

0-12 ft WC 47 ft WC

0-20 ft WC 100 ft WC

0-30 ft WC 100 ft WC

0-60 ft WC 200 ft WC

Output

Output signal

4-20 mA

Accuracy

Error in measurement (includes non-linearity,

hysteresis and repeatability, at 25°C (77°F))

0.3% of full scale value

Zero and span temperature effect

Temperature compensation

Between 6 and 12 ft H2O

20 ft H2O and greater

0°to +70°C (+32° to +158°F) referenced to +35°C (+95°F)

0.3%/10°C of full scale value

0.2%/10°C of full scale value

Zero and span long term stability

Between 6 and 12 ft H2O

20 ft H2O and greater

0.25% of full scale value/year

0.2% of full scale value/year

Vibration effect 0.05% of full scale / g from 10-500 Hz in any axis

Power supply effect 0.01% of full scale / V

Rated operating conditions

Ambient conditions

Operating temperature

Storage temperature

-30°to +85°C (-22°to +185°F)

-50°to +100°C (-58°to +212°F)

Degree of protection to DIN EN 60 529 IP68 (EN 60529)

Explosion Protection ATEX II 2G Eex ia IIC T4, FM, and CSA1

Electromagnetic compatibility

Noise immunity2

To DIN EN61326, NAMUR NE21

Design

Weight

Transmitter

Cable

0.4 kg (0.9 lbs)

0.1 kg/m (0.073 lbs/ft)

1Pending. Certifications had not been received at the time this manual was printed. Contact the factory for latest

information.

21.25% deviation with HF-conducted disturbance between 20-30 MHz

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